Half to lewis saunders



(No Model.) 2 Sheets-Sheet 1. W. B. FOWLER.

STEAM BOILER. V No. 462,975. Patented Nov. 10,1891.

(No Model.) 2 sheets Sheet 2. W. B. FOWLER.

STEAM BOILER. No. 462,975. Patented Nov. 10,1891.

ms rwnms rz-rzns'cu. mum-mum. WASHINGYC c4 UNITED STATES PATENT OFFICE.

\VALTER 13. FOlVLER, OF LAXVRENCE, MASSACHUSETTS, ASSIGNOR OF ONE-I-IALF TO LElVIS SAUNDERS, OF SAME PLACE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 462,975, dated'November10, 1891.

Application filed May 23, 1891- Serial No. 393.395. (No model.)

To all whom it may concern:

Be it known that I, WALTER B. FOWLER, of Lawrence, in the county ofEssex, State of Massachusetts, have invented certain new and usefulImprovements in Steam Boilers, of which the following isa descriptionsufficiently full, clear, and exact to enable any person skilled in theart or science to which said invention appertains to make and use thesame,

reference being had to the accompanying drawings, forming a part of thisspecification,

in Which Figure l is an elevation of my improved steam-boiler, a portionof the fire-box and :5 tubes being broken away; Fig. 2, an elevation,enlarged, showing the inner circulation-tubes Fig. 3, a verticaltransverse section, enlarged, of one of the circulation-tubes, showingthe method of attaching the heads and circulation-ducts; Fig. 4, a likeView illustrating modification, and Fig. 5 is a horizontal section takenon line on a: in Fig. 1.

Like letters and figures of reference indicate corresponding parts inthe different fig- 2 5 ures of the drawings.

My invention relates especially'to vertical boilers for marine engines,it being designed to enable extremely light material to be employed inthe construction of the boiler-tubes to effect rapid generation; and itconsists in certain novel features, hereinafter fully set forth andclaimed, the object being to produce a simpler, cheaper, and moreeifective device of this character than is now in ordinary use. 3 5 Thenature and operation of the improvement will be readily understood byall conversant with such matters from the following explanation:

In the drawings, A represents the fire-box,

40 and B the boiler considered as a whole.

The boiler comprises a central or body portion 0, which is arrangedvertically in the firebox and which has its lower end closed by aninwardly-depressed head (1, of the form shown in Fig. 3 and hereinafterdescribed.

On the top of thecylinder O a steamchest D is mounted, into which saidcylinder opens, and from said chest a steam-discharge pipe fleads.Vertical supplemental circulationtubes 9 are arranged around the body 0and enter the same near its top and bottom.

Arranged in a circle around the body 0 and alternating with thesupplementary pipes g there is a series of vertically-arrangedcirculation-tubes F. (Shown in detail in Fig. 3, 55. and described andclaimed in my application for United States Letters Patent for improvements in boiler-tubes filed May 23, 1891, Serial No. 393,894.) Thesetubes are of such length that they overlap the steam chest slightly.Each tube comprisesa metallic cylinder having its ends closed byinwardly-depressed heads cl, secured by rivets h in said cylinder. Eachhead dis provided with an inwardly-projecting annular flange 2', whichre-enforces that portion of the cylinder.- Horizontal ducts 7' areturned into the cylinder through said flange and open flush with theheads cl. Said re-enforcing flange enables very light material to beemployed in constructing the body of the cylinder and pre vents the samefrom breaking where the ducts are tapped in. Draft-tubes 7t connectcentrally through the heads (Z.

One of the tubes Fis tapped centrally bya pipe m, through which thewater-supply is pumped into the boiler. Said pipe is provided with acock 1).

A gage-pipe q taps the chest D and is connected by a branch 0' with thesupply 112.. Said pipe (1 is also connected by a branch t with the maincylinder 0, said branch passing centrally through the head 61 of saidcylinder. Ports 0) open into said cylinder flush with said head and intothe chest D to receive the horizontal circulation-ductsj, whereby thetubes E are mounted on the body.

Atrapw is connected with the lower end of the pipe qfor receiving refusefrom the boiler.

To re-enforce the tube E, which is tapped by the supply m, a collar 15is shrunken onto said tube and said port tapped therethrough. Instead ofsaid collar a re-enforcing ring may be disposed Within the tube F andeffect the same result asthe head-flange 2', if desired. 5

Said flanges 2' may be omitted from the head cl, as shown in themodification illustrated in Fig. 4, and the tube re-enforced at its endsby a collar 16, shrunken onto the outer side.

The boiler is filled by water pumped into too the supply m. Fire beingstarted in the firebox, the water in the body 0 circulates through thetubes g and between saidbody and the tubes F, also through the pipes 25q into the chest D. A large surface is exposed to the action of theheat, and by the peculiar construction described very light material canbe employed in forming the tubes, enabling the water in the boiler to berapidly heated.

Having thus explained my invention, What I claim is 1. A vertical boilercomprising a cylindrical body closed at one end and enlarged at theopposite end to form a steam-chest, a series of circulation-pipesopening into opposite ends of said body, a series of circulation-tubeshaving their ends closed by inwardly-depressed heads connected bydraft-tubes, and horizontal ducts flush with said heads and opening,respectively, into said chest and the lower end of said body, all beingcombined and arranged substantially as described.

2. A vertical boiler comprising a cylindrical body, a steam-chest at oneend thereof, supplemental Water-pipes opening at both ends into saidbody, vertical circulation-tubes arranged around said body, horizontalducts .connectin g said tubes With the chest and body,

a supply for said tubes, a discharge for said chest, and pipesconnecting the body, supply, and chest, substantially as specified.

3. A fire-box, in combination with a vertical boiler mounted therein andcomprising a main cylinder provided With a steam-chest,circulation-tubes opening into said chest and cylinder, fines connectingthe heads of said tubes, a supply opening into one of saidcirculationtubes, a discharge for said chest, and pipes connecting saidchest and supply and the main cylinder, substantially as described.

4. The cylinderO and chest D,'in combination with the tubes 9, openinginto said cylinder, the tubes F, having inwardly-depressed headsconnected by draft-tubes and re-enforcing bands or flanges, ductsopening into said tubes flush With said heads and connecting,respectively, with said cylinder and chest, the supply m for said tubes,the dischargeffor said chest, and the pipes q t, connecting said chestand supply with the main cylinder, substantially as described.

WALTER B. FOWLER.

Witnesses:

O. M. SHAW, KATHARINE DURFEE.

